Cisco ccnp bsci qualification bgp path reflector tutorial
Cisco CCNP/ BSCI Qualification: BGP Course Reflector Tutorial
Cisco CCNP/ BSCI Qualification: BGP Course Reflector Tutorial
In the copying, the routers R1, R2, and R3 are done in BGP AS 100. This is not a full mesh, nonetheless. There are peer relationships between R1-R2 and R1-R3, but not in between R2 and R3. R3 is marketing network 3.3.3.0/ 24 through BGP, Daniel CULLEN and the route is seen on R1. R1's iBGP next-door neighbor, R2 does not see the route.
A fundamental Go to this site policy of BGP is that a BGP speaker can not market a course to an iBGP neighbor if that course was picked up from an additional iBGP next-door neighbor. Setting up R1 as a course reflector will certainly permit us to circumvent this guideline. The whole course reflector process is clear to the customers, and no setup is essential on those customers. We'll set up R1 as a path reflector for both R2 and R3.
R1(config)#router bgp 100
R1(config-router)#neighbor 172.12.123.2 route-reflector-client
3 d18h: %BGP-5-ADJCHANGE: neighbor 172.12.123.2 Down RR client config change
R1(config-router)#neighbor 172.12.123.3 route-reflector-client
3 d18h: %BGP-5-ADJCHANGE: next-door neighbor 172.12.123.3 Down RR customer config change
The BGP adjacencies do come down when this arrangement is included, so this isn't something you want to do during a peak web traffic time.
Once the adjacencies come back up, R2 will have the course to 3.3.3.0/ 24.
There are various other possible options to this iBGP limitation, such as setting up BGP confederations. Those options are typically used on larger BGP deployments and with various other problems in mind, however, and setting up course reflectors offers this objective just as well.